I think Cox will be among the top 53 players, even if they try to sneak him to the PS.
Note that Cox got kicked off Georgia and Florida for a lot more reasons than the article listed. As clearly less talented players got in trouble for same thing and they did not get kicked off. But the public that were there don't seem to be publicly talking, and I don't think anyone else knows the truth. The little amount that has been made public, at minimum, he rubbed a hell lot of people the wrong way.
Cox himself tried to explain it as others don't understand his competitive nature (which I assume to means just how competitive he is), and that's what rubs people the wrong way.
But a lot of players are competitive as hell and don't get kicked off two SEC teams (especially Florida which has a reputation of allowing a good bit, though that reputation comes from when a different head coach was in charge).
Reminds me of when DT Mike Daniels would be screaming like hell in the locker room after any and all team losses, supposedly upset some.
So I don't think it's just his competitive nature, but maybe his attitude and demeanor and how he interacts with others when that competitive nature takes over and especially when he doesn't get his desired results. I think the coaches felt it negatively impacted those around him. But this is a bunch of guessing as no one will come out and directly bluntly say anything.
My guess is the kid puts a freaking ton of pressure on himself to preform at the highest levels of everything he does, and when he doesn't live up to his standards or he loses, sometimes things get too negative or too something that's seen as a negative to coaches.